Toxicology reports confirmed Friday that two teen girlfriends who died within hours of each other were killed by a lethal mix of drugs and alcohol.

Now, in a disturbing twist, CTV News has learned that a man living at the house where one of the girls was found has the same name as a convicted sexual predator.

The 16 and 17-year-old victims died just hours apart on March 2. The girls were friends, and witnesses report seeing them together on the previous evening.

Friends have identified the girls as Kayla LaLonde and Martha Jackson Hernandez.

LaLonde, a Vancouver resident, was found collapsed in the 4000-block of Rumble Street in Burnaby at about 12:40 a.m. Tuesday morning. She went into medical distress and did not survive.

Only hours later, 17-year-old Jackson Hernandez also went into medical distress in a Richmond home and died.

Troubling questions

Martin Tremblay was living in the house where she was found.

A man with the same name was sent to prison in 2003 on five counts of sexually assaulting teenage girls.

He admitted to inviting young girls to his house, plying them with alcohol, drugging them, and then videotaping himself having sex with them.

Richmond RCMP would not comment Friday on whether the Martin Tremblay living in the Richmond house is a convicted sexual predator.

The advocacy group Justice for Girls followed Tremblay's case as it made its way through the courts, and they say the circumstances of the two recent deaths raise troubling questions.

Speaking about the man from 2003, Annabel Webb told CTV News, "This man has a history of sexual violence against teenaged girls."

She added, "I am extremely disturbed and suspicious about the nature of that young woman's death, what happened."

Police won't comment on whether Tremblay is of any interest in the investigations into the deaths of the two teenagers.

And Cpl. Jennifer Pound said police aren't putting out a public warning.

"If a warning is needed, we will send one out," she said. "We don't think it's necessary at this point."

With a report from CTV British Columbia's Lisa Rossington